Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b76edea2676c6b9…

MALICIOUS

PDF

45.2 KB Created: 2021-05-11 19:24:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 82cffa7a8a6a341a0ed9e19e8bbe14cc SHA-1: 3ce2b2f251ade24319d5f73bc0513ab045693898 SHA-256: 7b76edea2676c6b9efbb3cd50d488920d6a6f56c30b47e46261fc1ee04c27773
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks or generators. The document body, though partially corrupted, contains a primary malicious URL and several other URLs pointing to similar lure content. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites or trick them into revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9551

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/406889139/coin-spin-link-game-hack In PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/get-me-robux_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/optifine-pe_GM479516143.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/game-toolbox_GM479516143.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/picture-roblox_GM431946152.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://www.gzvisiontech.com/Public/upload/editorfiles/robux-today_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a7b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A7B 26316 bytes
SHA-256: abc9fab8f213bbab0ab2dbbec8647522b564bba57238e24eee8964b1be1e41f7
font_01_sfnt_off0000869d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x869D 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9088 17560 bytes
SHA-256: 57c3f12a958430de31c97b672903314b9fe75859d953f53ff1226b802a2302e7

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